Water soluble monoazo dyestuffs containing a diphenylamine group carrying a sulphamoyl substituent and a sulpho or sulphato substituent

ABSTRACT

WHEREIN R1 represents hydroxyl, amino, alkylamino, dialkylamino, arylamino or sulphatoalkylamino, R2 represents hydrogen, sulphamoyl, alkylsulphamoyl, arylsulphamoyl or sulpho, R3 represents hydrogen, halogen, alkyl or alkoxy, R4 represents hydrogen or alkyl and R5 represents hydrogen, alkyl, acyl or arylsulphonyl, the -OR5 group being in the 2- or 4- position relative to the azo group and substituents R1 and R2 being so chosen that the dyestuff contains a single optionally substituted sulphamoyl group and a single sulpho or sulphato group. The dyestuff can be used to dye synthetic polyamide textile materials. They have excellent levelling properties and give reddish-yellow colorations having a high degree of fastness to wet treatments and to light.   Water-soluble monoazo dyestuffs for nylon which have the general formula:

[ Dec. 16, 1975 1 WATER SOLUBLE MONOAZO DYESTUFFS CONTAINING A DIPI-IENYLAMINE GROUP CARRYING A SULPIIAMOYL SUBSTITUENT AND A SULPHO OR SULPHATO SUBSTITUENT [75] Inventor: Denis Robert Annesley Ridyard,

Manchester, England [73] Assignee: Imperial Chemical Industries Limited, London, England [22] Filed: Oct. 3, 1972 [21] Appl. No.: 294,608

[30] Foreign Application Priority Data Oct. 12, 1971 United Kingdom 47452/71 [52] US. Cl.v 260/206; 260/205; 260/207;

1 260/207.1 [51] Int. Cl. C07C 107/06 [58] Field of Search 260/207.1, 207, 206, 205, 260/207.3

[56] References Cited UNTTED STATES PATENTS 2,879,269 3/1959 Merian 260/206 3,516,982 6/1970 Dimroth et a1. 260/207.1 3,535,306 10/1970 Altermatt et a1. 260/207.1 3,663,531 5/1972 Licchti 260/206 FOREIGN PATENTS OR APPLICATIONS 158,260 3/1940 Austria 260/206 1,943,250 3/1970 Germany 260/207 Primary Examinerl-lenry R. Jiles Assistant Examiner-Robert W. Ramsuer Attorney, Agent, or Firm-Cushman, Darby & Cushman 5 7] ABSTRACT Water-soluble monoazo dyestuffs for'nylon which have the general formula:

NO R R3 2 2 [bx R R1028 NH N=N wherein R represents hydroxyl, amino, alkylamino, dialkylamino, arylamino or sulphatoalkylamino, R represents hydrogen, sulphamoyl, alkylsulphamoyl, arylsulphamoyl or sulpho, R represents hydrogen, halogen, alkyl' or alkoxy, R represents hydrogen or alkyl and R represents hydrogen, alkyl, acyl or my]- sulphonyl, the -OR group being in the 2- or 4- position relative to the azo group and substituents R and R being so chosen that the dyestuff contains a single optionally substituted sulphamoyl group and a single Sulpho or sulphato: group. The dyestuff can be used to dye synthetic polyamide textile materials. They have excellent levelling properties and give reddish-yellow colorations having a high degree of fastness to wet treatments and to light.

2 Claims, No Drawings This invention relates tomonoazo dyestuffs and their application to textile materials. v 1

According to the invention there are provided water Amines of Formula Il may be prepared by reacting, using well established methods; 2-nitrochlorobenzene- 4-sulphonamide or the corresponding sulphonanilide and sulphonalkylamides with p-phenylene diamine sulphonic acid or by reacting 2-nitrochlorobenzene-4-sulphonic acid with p-phenylenediamine sulphonamide or the corresponding 'sulphonanilide and sulphonalkylamides. A third method of preparing amines of Formula soluble monoazo dyestuffs having the general formula: II is to react 2-nitrochlorobenzene-4-sulphonethanola- Examples of dyes'tuff structures of Formula 1 containing a single optionally substituted sulphamoyl group and a single sulpho or sulphato group include those wherein R 'is hydroxyl and R is sulphamoyl, alkylsulphamoyl or arylsulphamoyl, those wherein R is amino, alkylamino, dialkylamino or arylamino and R is sulpho and those wherein R is sulphatoalkylamino and R is hydrogen.

Halogen atoms which may be represented by R include chlorine and bromine atoms. Alkyl groups which may be represented by R, R and R and alkoxy groups which may be represented by R include lower alkyl and lower alkoxy groups, that is to say groups containing from one to four carbon atoms. Acyl groups which may be represented by R include acetyl and benzoyl. Arylsulphonyl groups which may be represented by R include benzenesulphonyl and p-toluenesulphonyl.

The dyestuffs of the invention may be prepared by diazotising an amine of the formula:

wherein R and R have the significances already stated, coupling the resulting diazo compound with a phenol of the formula:

(III) and, where necessary, converting the hydroxylgroup to alkoxy, acyloxy or arylsulphonyloxy by known methods.

mide with p-phenylene diamine followed by'sulphation of the resulting 4-amino-2-nitrodiphenylamine-4-sulphonethanolamides.

Suitable phenols of Formula III for use in making the dyestuffs of the invention include phenol, m-cresol, o-cresol, p-cresol, o-chlorophenol, 2,5-dimethylphenol, 6-chloro- 3-methylphenol, 3,5-dimethylphenol, 2,6-dimethylphenol, 2-methoxyphenol, 3-methoxyphenol and 4-methoxyphenol.

The dyestuffs of the present invention are particularly suitable for applying to synthetic polyamide textile materials,for example nylon 66, nylon 6 and nylon 11, using any of the general methods known for the application of acid dyestuffs to such materials. The dyestuffs have excellent levelling properties and give reddish-yellow colorations having a high degree of fastness to wet treatments and to light.

The invention is illustrated but not limited by the following Examples in which all parts and percentages are by weight.

EXAMPLE 1 A solution of 16 parts of 4-amino-2'-nitro-4'-sulphonamido diphenylamine-3-sulphonic acid in 200 parts of water and 10 parts of 36% sodium hydroxide solution is stirred at 20C and 25 parts of 2N sodium nitrite solution are added. The mixture is added with vigorous agitation during 20 minutes at l0-l5C to 24 parts of 36% hydrochloric acid in parts of water. After stirring for 1 hour at l0-l5C the diazo suspension is added during 30 minutes at l0-l 5C to a stirred solution of 4 parts of phenol in 100 parts of water, 8 parts of 36% sodium hydroxide solution and 8 parts of sodium carbonate. Stirring is continued for a further 1 hour at l0l5C, the pH is adjusted to 7 with hydrochloric acid and the product is filtered off, washed with 5% brine solution and dried.

When applied to nylon 66 from a weakly acid bath, a strong reddish yellow shade is obtained which exhibits very good wet fastness and light fastness combined with excellent levelling.

In place of the 4 parts of phenol used in the example there may be used 4.3 parts of 0-, m or p cresols when dyestuffs having similar properties are obtained.

EXAMPLE 2 A solution of 4.3 parts of the sulphuric ester of 4- amino-2 -nitrodiphenylamine-4 -sulphonethanolamide in 100 parts of water and 3 parts of 36% sodium hydroxide solution is stirred at 20C and 5 parts of 2N sodium nitrite solution are added. The mixture is added with vigorous agitation during 15 minutes at 5C to 6 parts of 36% hydrochloric acid in 50 parts of water. After stirring at 05C for a further 2 hours the diazo suspension is added during 30 minutes at O5C to a stirred solution of l partof phenol in 50 parts of water, 2 parts of 36% sodium hydroxide solution and 2 parts of sodium carbonate. Stirring is continued for a further 3 hours at 0-5C, sodium chloride (10% W/V) is added and the precipitated dyestufi is filtered off, washed with 5% brine solution and dried.

When applied to nylon 66 fabric from a weakly acid bath, a strong reddish-yellow shade is obtained which exhibits good fastness to wet treatments combined with excellent levelling properties and light fastness.

The sulphuric ester of 4-amino-2'-nitrodiphenylamine-4'-sulphonethanolamide used in this example may be obtained as follows: 2-nitrochlorobenzenesulphonylchloride is reacted with ethanolamine and the resulting 2-nitrochlorobenzenesulphonethanolamide is condensed with p-phenylenediamine in boiling 50% aqueous ethanol followed by sulphation of the resulting 2-nitro-4'-aminodiphenylamine-4-sulphonethanolamide in 98% sulphuric acid at 05C.

In place of the 1 part of phenol used in this Example there may be used 1.2 parts of o, m or p cresols when dyestuffs having similar properties are obtained.

The following Table gives further Examples of dyestuffs of the invention which may be obtained by diazotising the amines listed in the second column and coupling under alkaline conditions with the phenolic compounds listed in the third columnl EXAMPLE l7 20 Parts of diethylsulphate. are added to a solution of 5 parts of the hydroxy dyestuff prepared as in Example 1 in 200 parts of water and 10 parts of 36% sodium hydroxide solution and the mixture is stirred and heated at reflux for 2 hours. The reaction mixture is cooled to C and the product filtered off, washed with 5% brine solution and dried.

When applied to nylon 66 fabric from a weakly acid bath, a strong reddish-yellow shade is obtained which exhibits good fastness to wet treatments and to light.

EXAMPLE 18 If the 5 parts of hydroxy dyestuff in the above Example is replaced by 5 parts of the dyestuff prepared as in Example 2 a dyestuff with similar properties is obtained.

EXAMPLE 19 A solution of 5 parts of the hydroxy dyestuff prepared as inExample l in 100 parts of water and 3 parts of 36% sodium hydroxide solution is stirred at 80C. 4 Parts of p-toluenesulphonylchloride are added and the mixture is stirred at 80C for a further 2 hours before cooling to 20C. The product is filtered off washed with 5% brine solution and dried.

When applied to nylon 66 fabric from a weakly acid bath, a strong reddish-yellow shade isobtained which exhibits good fastness to wet treatments and to light.

The following Table gives further examples of dyestuffs of the invention which may be obtained by diazotising the amines listed in the second column, coupling 4-amino-2 '-nitro-4'-sulphonamidodiphenylamine -3-sulphonic acid.

3 ,S-dimethylphenol under alkaline conditions with the phenolic compounds listed in the third column followed by reaction with 5 alkylating or acylating agent listed in the fourth column.

20 4-amino-2-nitro-3-sulphodiphenylamine-4-sulphone thylamide. phenol dimethyl sulphate 21 m cresol ethyl chloride 22 4-amino-2'-nitro-3-sulphodiphenylamine-4'-sulphondimethylamide. o cresol diethyl sulphate 23 phenol acetic anhydnde 24 benzoyl chloride 25 p-toluene sulphonyl chloride.

26 4'amino-2-nitrodiphenylamine-4'-sulphonethanol- I amide sulphuric ester. phenol dimethyl sulphate 27 p-cresol ethyl chloride 28 3,5-dimethyl diethyl sulphate -phenol. 29 phenol acetyl chloride 30 benzoylchloride 5 6 We claim: R1 represents hydrogen or lower alkyl and l. A water-soluble monoazo dyestuff having the for- R3 represents hydrogen lower acetyl mula: or p-toluenesulphonyl, the -OR" group being m N R R 1 R14 R 0 s N=N wherein the 2- or 4-position relative to the azo group and R represents hydroxyl, amino, mono(lower alkyl) substituents R and R being so chosen that the amino, U y amino, nilino 0r sulphatoe- 15 dyestuff contains only one sulphamoyl and only thylamino, one of sulpho or sulphato. R represents hydrogen, sulphamoyl or sulpho, R represents hydrogen, chlorine, lower alkyl or 2. A water-soluble monoazo dyestuff as claimed in lower alkoxy, claim 1 which has the structure: 

1. A WATER-SOLUBLE MONOAZO DYESTUFF HAVING THE FORMULA:
 2. A water-soluble monoazo dyestuff as claimed in claim 1 which has the structure: 